public function contrastColors($backgroundColor)
{
$background = Color::stringToRgb24($backgroundColor);
$this->string = preg_replace_callback('/(?<!\\$)((?:\\$[\\$])*)(\\$[0-9a-f][^\\$]{0,2})/iu', function ($matches) use($background) {
$color = Color::stringToRgb24($matches[2]);
$color = Color::contrast($color, $background);
$color = Color::rgb24ToRgb12($color);
$color = Color::rgb12ToString($color);
return $matches[1] . '$' . $color;
}, $this->string);
return $this;
}
protected function none($value)
{
$style = '';
if ($this->currentStyle->getColor()) {
$color = Color::stringToRgb24($this->currentStyle->getColor());
$style .= sprintf('color:#%s;', Color::rgb24ToString($color));
}
switch ($this->currentStyle->getWidth()) {
case 0:
$style .= 'letter-spacing:-.1em;font-size:95%;';
break;
case 2:
$style .= 'letter-spacing:.1em;font-size:105%;';
break;
case 1:
default:
}
if ($this->currentStyle->isBold()) {
$style .= 'font-weight:bold;';
}
if ($this->currentStyle->isItalic()) {
$style .= 'font-style:italic;';
}
if ($this->currentStyle->isShadowed()) {
$style .= 'text-shadow:1px 1px 1px rgba(0,0,0,.5);';
}
if ($this->currentStyle->isUppercase()) {
$style .= 'text-transform:uppercase;';
}
if ($style) {
$value = sprintf('<span style="%s">%s</span>', $style, $value);
}
if ($this->link) {
if (parse_url($this->link, PHP_URL_SCHEME) !== null) {
$link = $this->link;
} else {
$link = 'http://' . $this->link;
}
$value = sprintf('<a href="%s" style="color:inherit;">%s</a>', $link, $value);
}
$this->result .= $value;
}
/**
* @dataProvider rgb24ToStringProvider
*/
public function testStringToRgb12String($input, $expected)
{
$rgb24 = Color::stringToRgb24($input);
$rgb12 = Color::rgb24ToRgb12($rgb24);
$this->assertEquals($expected, Color::rgb12ToString($rgb12));
}
